Improvement in filters



J. GRANT. Filter.

No. 213,896. Patented April I, 1879.

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UNITED STATES PATENT OEEIoE.

JOTT GRANT, OF BOSTON, MASSACHUSETTS.

IMPROVEMENT IN FILTERS.

Spec fication forming part of Letters Patent N0. 213,896, dated April 1,1879; application filed December 9, 1878.

1'0 all whom it may concern:

Be it known that I, JoTT GRANT, of the city of Boston, in the county ofSuffolk and State of Massachusetts, have invented certain new and usefulImprovements in Filters, of which the following is a specification:

My invention relates more particularly to that class of filters whichare used for domestic purposes; and consists in inclosing a hollow globein a spherical casin g, through which the water passes. Said globe has atube passing through it centrally, thus leaving a free passage for thewater when the globe is turned in the proper direction. The space withinthe globe and around the tube is filled with a tiltering-mixture, towhich the water has access through strainers located in orifices made inthe sides of the globe.

In the drawings, Figure 1 is an elevation of my filter. Fig. 2 is asection of the same, showing the hollow tube through which water has afree passage when it is not desirable to filter it. Fig. 3 is a section,showing the globe so turned that the water must pass through thefiltering-mixture.

Let A and B represent two hemispherical cases, which, when screwedtogether at S, form a hollow chamber for the reception of the metallicglobe O. The globe O has a tube,

D, passing through'its center, which allows a free passage of water whenthe globe is turned to the position shown in Fig. 2.

The space T within the globe and around the tube D is filled withcharcoal or some other suitable filtering-mixture.

E and E are two strainers, which serve to allow the passage of water.and also to prevent the charcoal from coming out.

When the globe is turned to the position shown in Fig. 3, itbecomes aperfect filter, the water having to pass through the filter ing-mixtureT before it can escape.

The neck H of the filter may be made with a screw, as shown; or anyother coupling (le vice may be used.

K is a handle, which passes through the shell B in the globe, and servesto operate the same.

I claim as my invention- In a filter, the combination of the globularcase 0 with tube D, strainers E E, and the filtering-mixture T,substantially as described, and for the purpose set forth.

JOTT GRANT.

\Vitnesses WILLIAM EDsoN, CHARLES H. Foco.

